Optical Follow-up of Gravitational-wave Events during the Second Advanced LIGO/VIRGO Observing Run with the DLT40 Survey
Optical Follow-up of Gravitational-wave Events during the Second Advanced LIGO/VIRGO Observing Run with the DLT40 Survey
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DOI：
10.3847/1538-4357/ab0e06
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发表时间：
2019-01
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通讯作者：
Shengqi Yang;D. Sand;S. Valenti;E. Cappellaro;L. Tartaglia;S. Wyatt;A. Corsi;D. Reichart;J. Haislip;V. Kouprianov
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作者：
Shengqi Yang;D. Sand;S. Valenti;E. Cappellaro;L. Tartaglia;S. Wyatt;A. Corsi;D. Reichart;J. Haislip;V. Kouprianov
我们描述了激光干涉仪引力波天文台和 Virgo 合作 (LVC) 的第二次科学运行 (O2) 期间引力波 (GW) 后续策略和距离小于 40 Mpc 巡天 (DLT40) 的后续结果。根据 GW 警报中提供的信息以及 LVC 发送的定位图，DLT40 将迅速响应，对我们的排名算法选择的相应星系进行成像，以便实时搜索可能的电磁 (EM) 对应星系。在 LVC O2 运行期间，DLT40 跟踪 10 个 GW 触发器，在每个事件的 GW 本地化区域内观察约 20 到 100 个星系。从这次活动中，我们在适当的源时间的GW本地化中识别出了两个真实的瞬变源——一个是不相关的SN Ia（SN 2017cbv），另一个是光学千新星AT 2017fgo/SSS17a/DLT17ck，与双中子星（BNS）聚结GW170817（又名伽马射线暴GRB）相关170817A）。最后，我们讨论了 DLT40 巡天对即将到来的 LVC O3 运行的计划，其中包括将我们的星系搜索范围扩展到 D ≈ 65 Mpc，以匹配 LVC 计划的 BNS 合并的三探测器灵敏度。
We describe the gravitational-wave (GW) follow-up strategy and subsequent results of the Distance Less Than 40 Mpc survey (DLT40) during the second science run (O2) of the Laser Interferometer Gravitational-wave Observatory and Virgo collaboration (LVC). Depending on the information provided in the GW alert together with the localization map sent by the LVC, DLT40 would respond promptly to image the corresponding galaxies selected by our ranking algorithm in order to search for possible electromagnetic (EM) counterparts in real time. During the LVC O2 run, DLT40 followed 10 GW triggers, observing between ∼20 and 100 galaxies within the GW localization area of each event. From this campaign, we identified two real transient sources within the GW localizations with an appropriate on-source time—one was an unrelated SN Ia (SN 2017cbv), and the other was the optical kilonova, AT 2017fgo/SSS17a/DLT17ck, associated with the binary neutron star (BNS) coalescence GW170817 (a.k.a gamma-ray burst GRB 170817A). We conclude with a discussion of the DLT40 survey’s plans for the upcoming LVC O3 run, which include expanding our galaxy search fields out to D ≈ 65 Mpc to match the LVC’s planned three-detector sensitivity for BNS mergers.